JobBuilder

JobBuilder是一個建造者模式，鏈式建造。通過靜態方法構建一個JobBuilder實例，然後再調用類方法Build()創建一個IJobDetail的實現。

1、靜態方法

public static JobBuilder Create()
{
    return new JobBuilder();
}

/// <summary>
/// Create a JobBuilder with which to define a <see cref="IJobDetail" />,
/// and set the class name of the job to be executed.
 
/// </summary>
/// <returns>a new JobBuilder</returns>
public static JobBuilder Create(Type jobType)
{
    JobBuilder b = new JobBuilder();
    b.OfType(jobType);
    return b;
}

/// <summary>
/// Create a JobBuilder with which to define a <see cref="IJobDetail" />,
/// and set the class name of the job to be executed.
 
/// </summary>
/// <returns>a new JobBuilder</returns>
public static JobBuilder Create<T>() where T : IJob
{
    JobBuilder b = new JobBuilder();
    b.OfType(typeof(T));
    return b;
}


/// <summary>
/// Create a JobBuilder with which to define a <see cref="IJobDetail" />,
/// and set the class name of the job to be executed.
 
/// </summary>
/// <returns>a new JobBuilder</returns>
public static JobBuilder CreateForAsync<T>() where T : IJob
{
    JobBuilder b = new JobBuilder();
    b.OfType(typeof(T));
    return b;
}

上面主要就是通過靜態方法創建一個對象實例，或並且制定他的jobType 類型。既然是使用的類型，那麽執行job任務的時候，一定是通過反射獲取對象的。

下面試類方法，設置jobType類型的。

這種設計一個jobType的好處就是，任務第三方提供的任務，只要繼承了 IJob接口的，都可以直接拿過來使用。

public JobBuilder OfType<T>()
{
    return OfType(typeof(T));
}

/// <summary>
/// Set the class which will be instantiated and executed when a
/// Trigger fires that is associated with this JobDetail.
/// </summary>
/// <returns>the updated JobBuilder</returns>
/// <seealso cref="IJobDetail.JobType" />
public JobBuilder OfType(Type type)
{
    jobType = type;
    return this;
}

2、StroreDurably Job持久化

默認情況下 job沒有trigger的時候會被刪除，

IJobDetail job = JobBuilder.Create<MyJob2>().StoreDurably(true).Build();

設置為true則不會刪除。

job和trigger都是存在ramjobstore這個裏面。

3、job名字

/// <summary>
/// Use a <see cref="JobKey" /> with the given name and default group to
/// identify the JobDetail.
/// </summary>
/// <remarks>
/// <para>If none of the ‘withIdentity‘ methods are set on the JobBuilder,
/// then a random, unique JobKey will be generated.</para>
/// </remarks>
/// <param name="name">the name element for the Job‘s JobKey</param>
/// <returns>the updated JobBuilder</returns>
/// <seealso cref="JobKey" /> 
/// <seealso cref="IJobDetail.Key" />
public JobBuilder WithIdentity(string name)
{
    key = new JobKey(name, null);
    return this;
}

/// <summary>
/// Use a <see cref="JobKey" /> with the given name and group to
/// identify the JobDetail.
/// </summary>
/// <remarks>
/// <para>If none of the ‘withIdentity‘ methods are set on the JobBuilder,
/// then a random, unique JobKey will be generated.</para>
/// </remarks>
/// <param name="name">the name element for the Job‘s JobKey</param>
/// <param name="group"> the group element for the Job‘s JobKey</param>
/// <returns>the updated JobBuilder</returns>
/// <seealso cref="JobKey" />
/// <seealso cref="IJobDetail.Key" />
public JobBuilder WithIdentity(string name, string group)
{
    key = new JobKey(name, group);
    return this;
}

/// <summary>
/// Use a <see cref="JobKey" /> to identify the JobDetail.
/// </summary>
/// <remarks>
/// <para>If none of the ‘withIdentity‘ methods are set on the JobBuilder,
/// then a random, unique JobKey will be generated.</para>
/// </remarks>
/// <param name="key">the Job‘s JobKey</param>
/// <returns>the updated JobBuilder</returns>
/// <seealso cref="JobKey" />
/// <seealso cref="IJobDetail.Key" />
public JobBuilder WithIdentity(JobKey key)
{
    this.key = key;
    return this;
}

就是制定job的名子，這裏名字類型為JobKey。如果沒有指定名字，則在Builder的時候制定一個GUID

if (key == null)
{
key = new JobKey(Guid.NewGuid().ToString(), null);
}

4、附加信息 UsingJobData SetJobData

構建job的時候可以指定一些附加信息，然後再job方法中可以拿到這些i信息。

IJobDetail job = JobBuilder.Create<MyJob2>().StoreDurably(true).WithIdentity("ceshi2").UsingJobData("zangfeng","123").Build();

public class MyJob2 : IJob
{

    public Task Execute(IJobExecutionContext context)
    {
        Console.WriteLine(context.JobDetail.JobDataMap["zangfeng"]);
        return Task.Factory.StartNew(() => Console.WriteLine($"工作任務測試2:{DateTime.Now.ToString("yyyy-MM-dd
HH:mm:ss")}"));
    }
}

Quartz.Net—Job